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Free keywords:
catalysis , silica supported silver catalysts , surface science , tpd
Abstract:
The present thesis examines in the context of the DFG project 1091 with the topic “From single crystal
systems to real catalysts on the example of the hydrogenation with silver catalysts”, the aspect of the
overcoming of the pressure- and material gap. For that the selective hydrogenation of Acrolein to
Allylalcohol with silver catalysts in the pressure range between 0,1mbar and 1bar with a reaction study
was investigated. Additional methods of the surface science like TPD, SEM, TEM, XRD and BET as
well was used to characterize the catalyst. The main question is the use of the method TPD to
characterize a real porous catalyst. The focus of this work is the combination of a reaction study
(applied research) and TPD (fundamental research).
A pressure barrier for the formation of Allylalcohol was found. First with a pressure ≥ 100mbar
Allylalcohol was formed. A treatment of the Catalyst with air elevates Conversion and selectivity to
Allylalcohol significant and reproducible. With the method TPD no conclusions to the elementary steps
of the reaction are possible. This method show mechanisms like diffusion, condensation and thermal
decomposition what overlay desorption.
